Out-of-bounds Read Affecting tftp package, versions <0:5.2-40.el9_8.1


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.47% (40th percentile)

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  • Snyk IDSNYK-RHEL9-TFTP-20877768
  • published13 Oct 2026
  • disclosed15 Sept 2026

Introduced: 15 Sep 2026

CVE-2026-85234  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade RHEL:9 tftp to version 0:5.2-40.el9_8.1 or higher.
This issue was patched in RHSA-2026:80663.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tftp package and not the tftp package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

A flaw was found in tftp-hpa. When the in.tftpd remap engine processes an inverse remap rule that also aborts with a non-empty custom error message, it can pass invalid match offsets to the genmatchstring() function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.

CVSS Base Scores

version 3.1